Jules Bianchi described his Marussia debut as "really positive" after driving for the team for the first time on the penultimate day of testing.

Having only been announced as Luiz Razia's replacement on Friday night, Bianchi had a seat fitting before driving the car for the first time today. Despite the quick turnaround Bianchi said it hadn't taken him long to feel comfortable with the new car and that it had been a good start to his Marussia career.

"It was really positive, I felt confident after three laps with the car so that was nice," Bianchi said. "Obviously we have some work to do but we know that and we will try to do our best to improve the car soon.

"I just want to get a lot of experience and try to get the best results I can. I think this is normal for a driver. I want to try to thank Marussia by doing a good result and this will be the target this year."

Bianchi admitted he had been on a rollercoaster of emotions during the last week but was now fully focused on learning quickly ahead of his grand prix debut.

"Obviously it's been special for me because it was a bit up and down. Now it's up, so I'm very happy. I really need to thank Marussia for the opportunity, the French Federation, Ferrari as well who helped me with the academy and there's nothing more to say. I'm really happy and I just did my best today to learn everything in the car and try to be ready for Australia."